Reductive dissolution of magnetite and jarosite by Acidiphilium cryptum JF-5

González, Ernesto; Espada, Amalia; Muñoz, J.A.; Blázquez, M.L.; González, F.; Ballester, A.

doi:10.1016/j.hydromet.2015.08.003

Cited by 12 publications

(10 citation statements)

References 29 publications

(26 reference statements)

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“…This was unlike the findings shown in Figure 1.A, which indicate no dissolution of solid under any conditions. This difference in findings may be attributable to differences in initial pH, 3.0 in the present experiment and 2.4 in in the study by González et al (2015a). Fe Total profiles obtained in medium amended with glycine or citrate (Figures 1.B and 1.C) are identical to those in Figure 1.A, showing that jarosite dissolution was not enhanced by these compounds.…”

Section: Resultscontrasting

confidence: 54%

“…Figure 1 displays Fe Total profiles recorded in this experiment while Table 2 shows global dissolution rates. Those rates were calculated as the overall difference in Fe Total over the duration of the experiment (14 d In previous experiments, jarosite dissolved slightly in the presence of A. cryptum in medium without added ligand (~1 mM in 14 days) (González et al 2015a). This was unlike the findings shown in Figure 1.A, which indicate no dissolution of solid under any conditions.…”

Section: Resultsmentioning

confidence: 87%

“…One liter of E medium contained: 2.0 g (NH 4 ) 2 SO 4 , 0.1 g KCl, 0.5 g K 2 HPO 4 , 0.5 g MgSO 4 ·7H 2 O, 0.3 g yeast extract and 3.0 g glucose (González et al 2015a). Inoculum propagation was carried out aerobically on an orbital shaker at 150 rpm and 35 ºC.…”

Section: Bacterial Strain and Culture Mediummentioning

confidence: 99%

“…Ammonium jarosite was synthesized in a bioreactor in the presence of a culture of Sulfolobus metallicus, as described elsewhere (González et al 2015a). Jarosite was weighed (0.60 g) and transferred to sterile vials (120 mL, 100 mL useful volume).…”

Section: Jarosite Synthesis and Disinfectionmentioning

confidence: 99%

“…The fact that dissolution reaction is driven by the extent of undersaturation with the oxide may explain why reductive environments or ligands enhance its dissolution rate (Cornell and Schwertmann 2003a), maintaining dissolved iron either as Fe(II) or Fe(III)-complex, respectively (Cornell and Schwertmann 2003b). Although the reaction model for ligands is not completely understood, ligands have been found to be active in microbial dissolution of goethite and hematite in EDTA-supplemented medium (Arnold et al 1988), in dissolution of hematite, goethite, magnetite, and jarosite in the presence of oxalate (Dehner et al 2010;González et al 2015a;González et al 2015b) and goethite in media containing EDTA and DPTA (diethylenetriaminepentaacetic acid) (Bridge and Johnson 2000). Even though several studies on bioreduction, secondary mineralization and dissolution of iron oxides by iron-reducing bacteria at circumneutral pH have been published (Arnold et al 1988;O'Loughlin et al 2010;Roh et al 2003), the effect of acidophilic iron-reducing bacteria has not been completely studied.…”

Section: Introductionmentioning

confidence: 99%

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Reductive Dissolution of Jarosite by Acidiphilium cryptum in Presence of Chelating Agents and Dissolved Iron

González

Muñoz

Blázquez

et al. 2016

Geomicrobiology Journal

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The mutual effects of Acidiphilium cryptum, nine ligands and dissolved iron on jarosite dissolution were studied in a 2 3 full factorial experiment. Ethylenediaminetetraacetic (EDTA), nitrilotriacetic (NTA) and oxalic acids were able to dissolve jarosite chemically, but bacterial action enhanced this dissolution; from 88±1, 46±0 and 36±0 µmol/L·d to 129±3, 177±5 and 106±14 µmol/L·d, respectively. Oxalate and NTA exhibited a synergistic effect with dissolved iron and bacteria that may be explained by a model in which iron complexes behave as redox mediators in the microbial respiration in which jarosite, a solid substrate, serves as terminal electron acceptor.

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Section: Resultscontrasting

confidence: 54%

Section: Resultsmentioning

confidence: 87%

Section: Bacterial Strain and Culture Mediummentioning

confidence: 99%

Section: Jarosite Synthesis and Disinfectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reductive Dissolution of Jarosite by Acidiphilium cryptum in Presence of Chelating Agents and Dissolved Iron

González

Muñoz

Blázquez

et al. 2016

Geomicrobiology Journal

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Greenalite-Chamosite composition, geothermometry and oxygen fugacity variations in pisolitic ironstone and carbonates of the Chilpi Group: implication on Paleoproterozoic seawater chemistry

Mohanty,

Mishra

2023

Phys Chem Minerals

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Production of poly (3-hydroxybutyrate) and extracellular polymeric substances from glycerol by the acidophile Acidiphilium cryptum

González,

Zuleta,

Zamora

et al. 2023

Extremophiles

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Acidiphilium cryptum is an acidophilic, heterotrophic, and metallotolerant bacteria able to use dissolved oxygen or Fe(III) as an electron sink. The ability of this extremophile to accumulate poly(3-hydroxybutyrate) (PHB) and secrete extracellular polymeric substances (EPS) has also been reported. Hence, the aim of this work is to characterize the production of PHB and EPS by the wild strain DSM2389 using glycerol in shaken flasks and bioreactor. Results showed that maximum PHB accumulation (37-42% w/w) was obtained using glycerol concentrations of 9 and 15 g L −1 , where maximum dry cell weight titers reached 3.6 and 3.9 g L −1 , respectively. The culture in the bioreactor showed that PHB accumulation takes place under oxygen limitation, while the redox potential of the culture medium could be used for online monitoring of the PHB production. Recovered EPS was analyzed by Fourier-transform infrared spectroscopy and subjected to gas chromatography-mass spectrometry after cleavage and derivatization steps. These analyses showed the presence of sugars which were identified as mannose, rhamnose and glucose, in a proportion near to 3.2:2.3:1, respectively. Since glycerol had not been used in previous works, these findings suggest the potential of A. cryptum to produce biopolymers from this compound at a large scale with a low risk of microbial contamination due to the low pH of the fermentation process.

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Reductive dissolution of magnetite and jarosite by Acidiphilium cryptum JF-5

Cited by 12 publications

References 29 publications

Reductive Dissolution of Jarosite by Acidiphilium cryptum in Presence of Chelating Agents and Dissolved Iron

Reductive Dissolution of Jarosite by Acidiphilium cryptum in Presence of Chelating Agents and Dissolved Iron

Greenalite-Chamosite composition, geothermometry and oxygen fugacity variations in pisolitic ironstone and carbonates of the Chilpi Group: implication on Paleoproterozoic seawater chemistry

Production of poly (3-hydroxybutyrate) and extracellular polymeric substances from glycerol by the acidophile Acidiphilium cryptum

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